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I am looking for one of the above ..500pf variable to complete the 1928 QST published Hartley Oscillator transmitter.
If you can help please let me know.
A picture of the cap can be seen here at the very bottom of this page on my website:
The caps are clearly stamped "NATIONAL DX" and are unique in that the connecting terminals are at the front and back rather than the more normal side position.
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